Abstract: It is well known that good well log data play an important part in reserves estimate,particular in non-normal complex litho logic gas reservoir, In these cases,a great deal of reservoir evaluation parameters are detcrmincd by log data proccssing and analysis,and some of them can not bc gattcn by core test, In certain extent,log data is the most rcliable data for stratigraphic corrclation. The normalization of log data is the premise both for gas reservoir deseription and lateral prediction.The accuracy of parameters from log data aro dopended on the selection of processing parameters.In this paper,wc introduce the whole process about log data application in reserves cstimate.